7 A solution is obtained by mixing 300 g of 25% solution
and 400 g of 40% solution by mass. Calculate the mass
percentage of the resulting solution.
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Mass of solute (1) = 300g × 25/100
= 75g
Mass of solute (2) = 400g ×40/100
= 160g
Total masss of solute = 75+160
= 235g
Total mass of solution = 300 + 400
= 700g
% composition by mass of solute = mass of solute / total mass of solution ×100
= 235/700 ×100
= 33.57% of solute
% composition by mass of solvent = 100 - 33.57
= 66.43%
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